22 A MANUAL OF DENTAL ANATOMY. 



the Caucasian races, adding also that the triple implantation 

 of the upper and the double implantation of the lower is 

 constant in the former races. More extended observations 

 have overthrown this statement as a positive dictum to be 

 accepted without exceptions, but it may nevertheless be 

 taken as expressing a general truth. 



FIG. 11 0. 



The milk teeth differ from the permanent teeth by being 

 smaller, and having the enamel terminating at the neck 

 with a thick edge, so that the neck is more distinctly con- 

 stricted. The incisors and canines are somewhat similar to 

 their successors, the canines, however, being relatively shorter 

 and broader than their successors. The first upper molars 

 have three cusps, two external and one internal : the second 

 more nearly resemble the permanent molars. 



The second lower deciduous molar has four cusps and 

 resembles a second lower permanent molar. The roots of 

 the deciduous teeth diverge from the neck at greater angles 

 than those of permanent teeth, in consequence of their more 

 or less completely enclosing between them the crypts in 

 which the latter are developing. 



( l ) Third lower molar of the left side. 



